Have you ever heard of a policy wonk? It's a person who likes studying the minutiae of legislation because it's fun for them. Some of us are, for lack of a better term, security wonks. We like exploring the theoretical details of security attacks, even though we recognize that they are not a part of our threat model. Please don't let us scare you. A lot of this is mental masturbation. It depends on time, geography, funding, and legislative will. The best guideline is to read your local paper and see what kinds of drugs and amounts are getting busted. That's what they care about.